Ration



May 30, 1933.

o. .l sUNDsTRAND DRIVE FOR PAPER CARRIAGES Filed otf. 11, 1930 Patented May 30, 1933 UNITED STATES PATENT OFFICE OSCAR J. SUNDSTRAN'D, 0F ROCKFORD, ILLINOIS, ASSIGNOR TO` SUNDSTRND CORPO- RATION, OF WIIMINGTON, DELAWARE, A CORPORATION OF DELAWARE DRIV'E FOR PAPER CARRIAGES Application filed October 11, 1930. Serial No. 487,999.

This invention relates to printing machines, as, for example, typewriting machines and machines for making and print-- ing computations, and it relates particularly to means for imparting the working stroke to the laterally movable paper carriage and for returning the paper carriage to or toward its initial position.

Inmachines 'of this character which are used, for instance, for bookkeeping purposes, the carriage must sometimes pass one or more intervening columnar positions without stopping. Such column-skipping requires that the carriage make a more or less extended movement. If propelled by a spring, the speed of the carriage increases during such a movement, and inasmuch as the carriage is often of considerable weight it acquires so much momentum that when it strikes the stop which arrests its movement in the desired columnar position, destructive stresses are set up unless means be provided to cushion the stoppage of the carriage. Many efforts have been made to provide effective cushioning means adapted for use in the above described situation, but so far as I am aware, no cushioning means has been devisedwhich is entirely satisfactory in checking a heavy carriage at the end of a relatively long jump.

A particular object of the present invention is to provide a means for imparting the working stroke to a paper carriage in 'such a way that the carriage shall not accelerate during an extended movement, thereby preventing the carriage from striking the stop with injurious force and thus obviating the necessity of employing cushioning means or making possible the use of effective cushioning means if cushioning means be desired.

In the accompanying drawing:

Figure 1 is a fragmental left-hand elevation of a bookkeeping machine embodying the features of my invention.

Fig. 2 is a fragmental detail view of a portion of the driving connection between the electric motor and the carriage.

Fig. 3 is a fragmental view of the positive driving connection between the motor and the carriage.

carriage and at its other end to a drum 5 v 'containing a helical spring G.` The spring 6 tends to revolve the drum 5 in the direction to wind up the flexible member 4c and thus cause the carriage to move toward the left of the operator, toward the observer in Fig. 1 and to the right in the rear view, Fig. 3. Before being wound up on the drum 5, the draw-band 4 passes part way around said drum, thence past an idler pulley 7, thence around a pulley 8, thence past a guide pulley 9 and thence to the winding drunf 5. Thewinding drum is rotatably mounted in the stationary framework of the machine adjacent to and below the path of movement of the paper carriage. In the construction herein. shown, the pulleys 7 and 8 are mounted one directly below the other and j directly below the winding drum 5.

The pulley 8 is rotatably mounted upon a shaft 10 which is journaled in the machine frame and which carries a pulley 11 which is driven from the rear end of the shaft 12 of an electric motor 13 through the medium of a belt 14. The motor 13 may operate continuously, if desired.

Means is provided whereby the pulley 8 is free to revolve upon the shaft 10 in one direction, but cannot overrun the shaft in the opposite direction. While said means may be of various forms, I have herein shown a lug l5 (Fig. 2) on one end of said pulley, said lug having at one side a square shoulder and at the opposite side an inclined surface. Fixed to the shaft 10 adj acent to the pulley 8 is a collar 16 carrying a pin 17 which is pressed outwardly by a shaft 10. Consequently, when the spring 6 is moving the carriage 1 in the tabulating or working direction, the spring cannot move the carriage any faster than the motor will permit, since the square shoulder on the lug 15 will be bearing against the pin 17 and will be ,restrained by said pin from revolving any faster than the shaft 10 is turning. When, however, the paper carriage is being returned to or toward its initial position against the tension of the spring 6, the pul-v ley 8 is free to revolve in the direction opposite to which the shaft 10 is turned, the pin 17 yielding to allow the inclined surface on the lug 15 to pass.

If desired, power means may be provided for returning the paper carriage to or toward its initial position. This means may be of any preferred character. Herein I have shown a gear train indicated generally by the reference numeral 19 through which power is transmitted from the forward end of the motor shaft 12 to a vertical shaft 20. Rotatably mounted upon the upper end of the shaft 20 is a pinion 21 that meshes with a rack 22 which is fixed to and extends longitudinally of the paper carriage 1. The pinion 21 is arranged to be connected to rotate with the shaft 2O by means of a clutch collar 23 adapted to engage a clutch face 24: on the pinion 21. The clutch collar 23 is lslidably and non-rotatably connected to the shaft 20 by means of a spline 25 (Fig. 3). Means of any ordinary or preferred character may be provided for shifting the clutch collar 23 into and out of engagement with the pinion 21 either automatically or manually, or both, at any desired points 1n the travel of the carriage.

Tabulating or escapement stops of any ordinary or preferred construction may b e employed to arrest the carriage in its varlous columnar positions.- Herein I have 1ndicated stops 26 on the carriage and a coacting stop 27 suitably supported on the stationary framework of the machine. When the cross-tabulating movement of the carriage is interrupted through engagement of a stop 26 with the relatively stationary stop 27 the pulley 8 of course also stops, the pin 17 yielding to pass by the inclined shoulder on the lug 15 as the shaft 10 continues to revolve. Likewise, when the carriage is being returned to or toward its initial position,

Moreover, when the carriage is arrested in a given columnar position or is being returned, there is no objectionable slippage between the motor and the carriage, the slippage of the pin 17 over the inclined side of the lug 15 producing a negligible amount of wear.

I claim as my invention:

1. In a printing machine, the combination of a laterally movable paper carriage, a spring-actuated drum located adjacent to and below the path of movement of the carriage, a flexible element connected to the carriage and the drum, an'intermediate pulley over which said element extends before it is wound on said drum, said pulley being located below the drum, an electric motor, a shaft driven by said motor, said pulley being mounted in axial alinement with said shaft, a member on said shaft adjacent to one end of the pulley, a pin on said member spring-pressed into engagement with the adjacent end of said pulley, and a lug on said end of the pulley having a square shoulder to engage the pin when the pulley and the shaft are rotated in the same direction, and an inclined surface adapted to slip past the pin when the pulley and the shaft are relatively rotated in opposite directions.

2. In a printing machine, the combination of a laterally movable paper carriage` a spring-actuated drum, a iiexible element connected to the carriage and the drum, an intermediate pulley over which said element extends before it is wound on said drum, an electric motora member arranged to be rotated by said motor, and a projeci tion on said intermediate pulley arranged to be engaged and restrained by said member when said member and said pulley are rotating in the same direction, said member being arranged to yield when said member and said pulley are relatively rotated in an oppositeA direction.

3. In a printing machine, the combination of a laterally movable paper carriage, a spring-actuated drum, a flexible element connected to the carriage and the drum, an electric motor, a member arranged to be rotated by said motor, and a part arranged to revolve when the drum revolves and to be engaged and restrained by said member when said member and said part are rotating inthe same direction, saidv member being arranged to ield when said member and said part are re atively rotated in an opposite direction.

f1. In a printing machine, in combination, a laterally movable paper carriage, a spring connected to the carriage, a motor, a member arranged to be rotated by said motor, and a part arranged to revolve when the carriage moves and to be engaged and restrained by said member when saidmember and said part are rotating in the same direction.

5. In a printing machine, the combination of a laterally movable paper carriage, a spring-actuated drum, a flexible element connected vto the carriage and the drum, an intermediate pulley over which said element extends before it is Wound on the drum, an electric motor, and means actuated by the motor for restraining the intermediate pulley when the spring is operating.

6. In a printing machine, the combination of a laterally movable paper carriage, a spring connected to produce a cross-tabulating movement of the carriage, and an element positively rotated independently of said carriage for restraining the spring during such movement of the carriage. Y

7 In a printing machine, the combination of a laterally movable paper carriage, a spring connected to produce a cross-tabulating movement of the carriage, and an electric motor connected to restrain the spring during such movement of the carriage.

8. In a printing machine, the combination of a laterally movable paper carriage, a spring connected to the carriage, an element for restraining the spring during movement of the carriage, and an electric motor for positively actuating said element.

9. In a printing machine, the combination of a laterally movable paper carriage, a spring for moving the carriage in one direction, and means defining an abutment moving at a substantially constant rate of speed to control the speed of travel of said carriage under the influence of said spring.

10. In a printing machine, the combination of a laterally movable paper carriage, a spring-actuated drum, a connection between the carriage and the drum, an electric motor, a member arranged to be rotated by said motor, a part arranged to revolve when the drum revolves; and an automatically engageable connection between the part and the member preventing rotation of the part in the same direction as the member at a speed greater than the member. a

11. In a printing machine, 'the combination of a laterally movable paper carriage, a spring-actuated drum for advancing said carriage, an electric motor, and means actuated by` said motor for restraining said drum while advancing said carriage.

12. In a printing machine the combination of a laterally shiftable paper carriage, means for advancing the carriage from one columnar position to another columnar posi-H tion, said means exerting a constant force tending to produce an accelerated movement of said carriage, a second means eective to propel said carriage in a reverse direction at constant speed and means actuated by said second carriage propelling means to control the speed of movement of said carriage during advancing movement.

13. In a printing machine, the-combination of a laterally movable'paper carriage, means effective to advance the carriage in a cross-tabulating movement, a constant speed driver effective to propel said carriage Vin a return movement, and means operated by said driver to control the .speed of said carriage in cross-tabulating movements.

14. In a printing machine,A the combination of a laterally shiftable paper carriage, means for moving the carriage from one columnar position to an advanced columnar position, va second means for moving the carriage-to a precedent columnar position and means actuated by said second mentioned I means to control the rate of speed of said carriage in moving to an advanced columnar position.

15. In a printing machine, the combination of a laterally shiftable paper carriage, means orfadvancing the carriage in crosstabulating movements from one columnar position to another columnar position, said means exerting a constant force .tending to produce anv accelerated movement of said carriage, a constant speed driver, and connections between said carriage advancing mea-ns and said driver effective to control the speed of advance of said carriage.

16. In a printing machine, the combination of a laterally shiftable paper carriage, means effective to advance the carriage at an accelerating rate of speed, a second means to return the carriage at a substantially constant rate of speed, and means automatically operated by said second means during a carriage-advancing movement to control the rate of speed of carriage advance.

In testimony whereof, I have hereunto aiiixed my signature.

' OSCAR J. SUNDSTRAND. 

